All rescuers are trained to recognize that a distress call can be any series of three signals: three blasts of a plastic whistle, flashes with a reflective device (e.g., mirror or old CD), flashes from a flashlight, rocks hit together three times, or fires arranged in a circle, triangle or a line. A rescuer who hears or sees these signs will head to that location. When signaling, it is important to stay where you are. As rescuers get closer, they will respond with two blasts from a whistle or other signaling device. The sound of a whistle will carry farther than the sound of your voice.